#include <REGX52.H>
#include "Delay.h"

/**
	*	@brief  矩阵键盘读取按钮键码
	* @param  无
	* @retval KeyNumber 按下按键的键码值
	*/

unsigned char Matrixkey()
{
	unsigned char KeyNumber=0;
		
	P1=0xFE;//1111 1110
	P1_3=0;
	if(P1_7==0){Delay(20);while(P1_7==0);Delay(20);KeyNumber=1;}
	if(P1_6==0){Delay(20);while(P1_6==0);Delay(20);KeyNumber=4;}
	if(P1_5==0){Delay(20);while(P1_5==0);Delay(20);KeyNumber=7;}
	if(P1_4==0){Delay(20);while(P1_4==0);Delay(20);KeyNumber=10;}
	
	P1=0xFE;
	P1_2=0;
	if(P1_7==0){Delay(20);while(P1_7==0);Delay(20);KeyNumber=2;}
	if(P1_6==0){Delay(20);while(P1_6==0);Delay(20);KeyNumber=5;}
	if(P1_5==0){Delay(20);while(P1_5==0);Delay(20);KeyNumber=8;}
	if(P1_4==0){Delay(20);while(P1_4==0);Delay(20);KeyNumber=14;}
	
	P1=0xFE;
	P1_1=0;
	if(P1_7==0){Delay(20);while(P1_7==0);Delay(20);KeyNumber=3;}
	if(P1_6==0){Delay(20);while(P1_6==0);Delay(20);KeyNumber=6;}
	if(P1_5==0){Delay(20);while(P1_5==0);Delay(20);KeyNumber=9;}
	if(P1_4==0){Delay(20);while(P1_4==0);Delay(20);KeyNumber=15;}
	
	P1=0xFE;
	P1_0=0;
	if(P1_7==0){Delay(20);while(P1_7==0);Delay(20);KeyNumber=4;}
	if(P1_6==0){Delay(20);while(P1_6==0);Delay(20);KeyNumber=8;}
	if(P1_5==0){Delay(20);while(P1_5==0);Delay(20);KeyNumber=12;}
	if(P1_4==0){Delay(20);while(P1_4==0);Delay(20);KeyNumber=16;}
	
		return KeyNumber;
}